288 PROCEEDINGS OF THE ACADEMY OF [Apr., 



19 rows, VI added, right 52d, left 52d gastrostege, making: 



21 rows, VI ends, right 199th, left 194th gastrostege, leaving: 



19 rows, which are continuous to the vent. 



CYLINDEOPHIS Wagler. 



Since the publication of the Catalogue of the Snakes in the British 

 Museum, there have been described two new^ species belonging to 

 the Ilysiidae. Both of these new forms are in the genus Cylindrophis, 

 the species of which may be distinguished as follows: 



I — Diameter of the eye about half its, distance from the nostril. 



Interocular width more than the length of the snout rufus. 



Interocular width equal to the length of the snout isolepis. 



II — Diameter of the eye one-third to one-fourth its distance from 

 the nostril. 

 A — Ventrals not twice as large as the contiguous scales. 



Scales in 23 rows opisthorhodus. 



Scales in 21 to 19 rows maculatus. 



B — ^ Ventrals nearly twice as large as the contiguous scales. 

 Scales in 21 rows lineatus. 



CylindropMs rufus (Laurenti). 



Specimen. — California Acad. Sci., No. 33,054. Sarawak, Borneo. 

 Male; total length 454, tail 11 mm. 



Squamation. — The number of scale-rows on the body, the sequence 

 in which they become suppressed, and the gastrostege level at which 

 they terminate are as follows: 



Neck:' 

 21 rows, IV row ends, right 8th, left 8th gastrostege, leaving: 



Body: 

 19 rows, V row ends, right 195th, left 190th gastrostege, leaving: 

 17 rows, which are continued to the vent. 



Gaetrosteges 202; anal divided; urosteges 6, second and fourth 

 divided, the remainder entire. Prsefrontal enters the eye; frontal 

 larger than the supraocular, larger than the parietal, longer than its 

 distance from the rostral; a small postocular; supralabials 6, the 

 third and fourth entering the eye; infralabials 6; a single pair of 

 geneials; one pair and two azygos gular shields. 



Anatomy. — The tracheal membrane is narrow and is not lined with 

 pulmonary tissue. The trachea terminates just caudad to the left 

 bronchus. The right intra pulmonary bronchus terminates at the 

 61st gastrostege. It appears as the narrowed continuation of the 



2 Cylindrophis isolepis Boulenger, 1896, Ann. Mag. Nat. Hist., (6), vol. XVIII, 

 p. 62, Jampea, Id. 



C. opisthorhodus Boulenger, 1897, loc. cil., vol. XIX, p. 506, Lombok. 



